Dalmanelloidea
A superfamily of Brachiopod, brachiopods containing: * Family Dalmanellidae * Family Angusticardiniidae * Family Dicoelosiidae * Family Harknessellidae * Family Heterorthidae * Family Hypsomyoniidae * Family Kayserellidae * Family Mystrophoridae * Family Paurorthidae * Family Platyorthidae * Family Portranellidae * Family Proschizophoriidae * Family Rhipidomellidae * Family Tyronellidae References

Orthida Prehistoric animal superfamilies {{Brachiopod-stub ...
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Orthida
Orthida is an extinct order of brachiopods which appeared during the Early Cambrian period and became very diverse by the Ordovician, living in shallow-shelf seas. Orthids are the oldest member of the subphylum Rhynchonelliformea, and is the order from which all other brachiopods of this group stem. Physically they are usually strophic, with well-developed interareas. They also commonly have radiating ribs, sulcus, and fold structures. Typically one valve, often the brachial valve, is flatter than the other. The interior structure of the brachial valves are usually simple. In shape they are sub-circular to elliptical, with typically biconvex valves. There is some debate over the forms that first appeared of this order as to how they should be classified. However, they began to differentiate themselves by the late Early Cambrian period, and by the late Cambrian period had diversified into numerous varieties and reach 2 to 5 cm in width. Specimens from the late Cambria ...
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